harddrive problem.. help urgent..

[cc2918]

Here is step by step of issue I had.. I would like to know whats going on..

I was updating my Vista Ultimate for language packs.
3/4 language packs were installed fine until 4th installation.. system starting to slow down..
My gf was surfing on the web using firefox while it was being updated.

After about 5-10min, it failed update.
Restarted the laptop.. before vista was even loading.. it gave me blackscreen error something about I/O, 0xC(something with additional numbers), Winload.exe
Safe mode doesnt work as well.

After letting laptop cool off for few hrs.. it successfully logged on to safe mode.. so I backed up some files(some were corrupted.. maybe due to force shutdown using power switch)
Did a clean reinstallation of Windows Vista... I suspected that problem was either OS or Harddrive.

So I ran chkdsk.. I see some bunch of boot files and windows/winsxs files being corrupted(bad sectors)
Is this normal for chkdsk?
Took long ass time for chkdsk.. i had to forcefully shutdown again.
But regardless of corrupted boot files.. I can log on vista with no problem.

Is this sign of harddrive failing?
I need to know this fast.. cause I may have to summit RMA form.. and deadline is very soon.
thanks in advance.